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We apply stochastic hydrodynamics to the study of charge density fluctuations in QCD matter undergoing Bjorken expansion. We find that the charge density correlations are given by a time integral over the history of the system, with the…

Nuclear Theory · Physics 2014-06-09 B. Ling , T. Springer , M. Stephanov

One of the unsolved problems in the current 'standard model' of heavy ion physics is the apparent rapid thermalization of QCD matter in the pre-equilibrium stage. While it is challenging to probe this mechanism directly, there are now…

High Energy Physics - Phenomenology · Physics 2015-06-22 Thorsten Renk , Rupa Chatterjee , Kari J. Eskola , Harri Niemi , Ilkka Helenius

The evolution of a relativistic heavy-ion collision is typically understood as a process that transmutes the initial geometry of the system into the final momentum distribution of observed hadrons, which can be described via a cumulant…

Nuclear Theory · Physics 2021-02-03 Jefferson Sousa , Jorge Noronha , Matthew Luzum

We propose a modification of the hydrodynamic model of the dynamics in ultrarelativistic nuclear collisions. A modification of the energy-momentum tensor at the initial stage describes the lack of isotropization of the pressure.…

Nuclear Theory · Physics 2009-09-24 P. Bozek

In this study we examine the impact of the initial stage and dynamical evolution on final-state observables in heavy-ion collisions. For this goal we develop a novel approach, EPOSir+PHSDe, which employs EPOS initial conditions as the…

High Energy Physics - Phenomenology · Physics 2025-09-09 Mahbobeh Jafarpour , Vadym Voronyuk , Klaus Werner , Elena Bratkovskaya , Damien Vintache

We explore the effects of including the energy dependence determined from evolution equations within the color glass condensate framework on observables in ultra-relativistic heavy-ion collisions. This amounts to integrating the JIMWLK…

Nuclear Theory · Physics 2025-02-10 Heikki Mäntysaari , Björn Schenke , Chun Shen , Wenbin Zhao

We develop a (3+1)-dimensional hybrid evolution model for heavy-ion collisions with dynamical sources for the energy-momentum tensor and baryon current. During an initial pre-equilibrium stage based on UrQMD, the four-momenta and baryon…

Nuclear Theory · Physics 2019-01-23 Lipei Du , Ulrich Heinz , Gojko Vujanovic

We develop a far-from-equilibrium hydrodynamic model to evolve ultrarelativistic heavy-ion collisions in event-by-event simulations. Anisotropic hydrodynamics is designed to better handle the strong and highly anisotropic expansion during…

High Energy Physics - Phenomenology · Physics 2021-05-14 Mike McNelis

We initiate a holographic study of coupling-dependent heavy ion collisions by analysing for the first time the effects of leading-order, inverse coupling constant corrections. In the dual description, this amounts to colliding gravitational…

High Energy Physics - Theory · Physics 2017-07-20 Sašo Grozdanov , Wilke van der Schee

Kinetic equilibration during the early stage of a relativistic heavy ion collision is studied using a radiative transport model. Thermalization is found to dominate over expansion with medium regulated cross sections. Pressure anisotropy…

Nuclear Theory · Physics 2009-03-13 Bin Zhang

Correlations related to local charge conservation provide insight into the creation and evolution of up, down and strange charges in the quark-gluon plasma. Here, the evolution of charge correlations is overlaid onto a hydrodynamic…

Nuclear Theory · Physics 2019-05-01 Scott Pratt , Christopher Plumberg

We include the perturbative JIMWLK energy evolution into the IP-Glasma initial state description used to simulate the early-time dynamics in heavy ion collisions. By numerically solving the JIMWLK equation on an event-by-event basis, we…

Nuclear Theory · Physics 2025-08-29 Heikki Mäntysaari , Björn Schenke , Chun Shen , Wenbin Zhao

We study how the inclusion of energy dependence as dictated by quantum chromodynamic (QCD) small-$x$ evolution equations affects key observables in ultra-relativistic heavy-ion collisions. Specifically, we incorporate JIMWLK evolution into…

Nuclear Theory · Physics 2026-03-20 Heikki Mäntysaari , Björn Schenke , Chun Shen , Wenbin Zhao

Dissipative processes in relativistic fluids are known to be important in the analyses of the hot QCD matter created in high-energy heavy-ion collisions. In this work, I consider dissipative corrections to energy and conserved charge…

Nuclear Theory · Physics 2018-10-08 Akihiko Monnai

Dissipative processes are pivotal for understanding the hydrodynamic evolution of hot and dense QCD matter created in relativistic nuclear collisions. The interplay of multiple conserved charges -- net baryon, strangeness, and electric…

Nuclear Theory · Physics 2026-01-21 Akihiko Monnai , Grégoire Pihan , Björn Schenke , Chun Shen

We present an overview of the current state of understanding of the early time dynamics of high-energy heavy-ion collisions, emphasizing recent developments and connections between the physics of the initial state and that of hard probes in…

High Energy Physics - Phenomenology · Physics 2019-01-01 S. Schlichting

We review progress in the hydrodynamic description of heavy-ion collisions, focusing on recent developments in modeling the fluctuating initial state and event-by-event viscous hydrodynamic simulations. We discuss how hydrodynamics can be…

Nuclear Theory · Physics 2015-06-12 Charles Gale , Sangyong Jeon , Bjoern Schenke

In this study we model early times dynamics of the system produced in relativistic heavy ion collisions by an initial color electric field which then decays to a plasma by the Schwinger mechanism, coupling the dynamical evolution of the…

High Energy Physics - Phenomenology · Physics 2016-04-20 M. Ruggieri , A. Puglisi , L. Oliva , S. Plumari , F. Scardina , V. Greco

We present a fully three-dimensional model providing initial conditions for energy and net-baryon density distributions in heavy ion collisions at arbitrary collision energy. The model includes the dynamical deceleration of participating…

Nuclear Theory · Physics 2018-02-21 Chun Shen , Björn Schenke

We present an extended Bayesian analysis using Trajectum where the initial condition can now include binary scaling. For the far-from-equilibrium evolution before hydrodynamics we introduce an interpolation between free streaming and a…

Nuclear Theory · Physics 2023-04-14 Govert Nijs , Wilke van der Schee